easy one to do, locate it first, follow the 3 inch radiator hose from the top of the radiator to the top of the engine and it should be where this hose connects to the engine, Two bolts to remove-remove them, gently tap the little housing with a piece of wood or wedge a screwdriver between the block and 4-5 inch housing and pop it up,
.clean and scrap off the surfaces that touch each other, install new thermostat with the proper side down, just as the old one came out, apply gasket sealer to the gasket and block. put the little housing on and turn in the two bolts, do not over tighten
(some thermostats have a design with a different gasket, a rubber one that needs no sealer, check when you remove)
after tightening the bolts, add antifreeze, leave cap off, start it up and wait until the level drops down, add more to fill, then close cap. Run engine or drive, next day fine too, third day before starting it up, open cap to recheck antifreeze level, add and apply cap.